The drone, downed near a combat outpost in the town of At-Tanf, was the second one shot down by USA forces in 12 days; the downing comes as Pentagon officials are working to defuse heightened tensions in southeastern Syria.
The US military said the drone was Iranian-made but it was unclear who was operating it.
The Syrian jet has been identified to be an SU-22 while the American Aircraft that brought the Syrian Jet down has been identified to be aF/A-18E Super Hornet.
"The absence of a civilian-led United States strategy in Syria and the narrow USA military focus on ISIS will continue to provide an open invite for the pro-Assad regime coalition to extend and escalate", Cafarella said.
Russian Federation warned the USA that henceforth it will treat US-led coalition planes flying west of Euphrates, the redline it chose to set for the U.S. military, as targets.
A statement from Australia's Defense Ministry said it would monitor the "air situation in Syria" and make a decision on resuming airstrikes there "in due course".
On several occasions in recent weeks, warplanes of the US-led coalition have also struck pro-government forces to prevent them advancing from the Al Tanf garrison in south-eastern Syria at a spot where the country's borders join Iraq and Jordan.
There are tensions long running between the United States and Russian Federation that erupted on Monday publicly as Moscow condemned the downing of American military's of a Syrian warplane and threatened to aim aircraft flown by the United States and its allies.
"If the developments in Syria pose a threat, if we're faced with such an event, the whole world should know this: we'll do there what we did during (Operation) Euphrates Shield", Erdogan said, addressing Syrian refugees during a Ramadan fast-breaking dinner near the border with Syria.
Australia will soon resume airstrikes on ISIS targets in Syria after a temporary suspension due to threats against United States and coalition missions from Russian Federation.
On Sunday, a USA fighter jet downed a Syrian government warplane for the first time in the country s conflict south of Raqa, sparking an angry reaction from regime ally Russian Federation.
U.S. support of anti-Islamic State militias such as the ones in At Tanf and the Syrian Democratic Forces has increasingly put it into direct conflict with Syria and its allies Russia, Iran, and Shiite militias. Israeli security officials said Monday they were studying the missile strike to see what they could learn about its accuracy and capabilities.
In a statement, the Syrian military described the downing of its plane as an act of "blatant aggression" on the part of the United States and accused the USA of coordinating with ISIS.